Deputies say they don't believe the driver, 59-year-old David Herman of Hillsboro was intoxicated. They are investigating what caused Herman to drive erractically. He was taken to the hospital for tests.

Deputies say the car was heading south on 160th when it hit another car, traveled across Farmington at Medallion, swerved down the road and then into the yard, hitting mailboxes and a tree. The car was going so fast that one of the mailboxes was sent into the tree.

Hornych was in her front yard with her sister when she was hit, deputies say. A witness said neighbors attempted CPR on Hornych but she wasn't breathing when the ambulance arrived.

Kylie Bailey lives across the street and heard Hornych's little sister's screams for help. Bailey tried to pull her away.

"She was crying. She was bawling her eyes out over her sister. And I just pulled her away from it. I just asked her to come over to the sidewalk with me (and) not to look," Bailey said.

Hornych was a fifth-grader at Chehalem Elementary School in the Beaverton School District.

The school will have counselors on hand in the morning to help students and staff, according to the sheriff's office.

Herman stayed at the scene and is cooperating, sheriff's deputies said.

The investigation into the crash is ongoing into what caused the crash.

Editorial note: Initial reports from the sheriff's office indicated Hornych was 9 years old. Her age was later corrected to 11 years old.